<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			var a = 10;
			var b = "hello world"
			var c = 20;
			document.writeln(a+b+"</br>")
			document.writeln(a+c+"</br>")
			document.writeln(a*c+"</br>")
			document.writeln(c/a+"</br>")
			document.writeln(c%a+"</br>")
			document.writeln((c+=a)+"</br>")
			
		</script>
		<script>
			var age = 30;
			document.writeln("my age = "+age+"</br>")
			document.writeln("my age = "+(age==20)+"</br>")
			document.writeln("my age = "+(age>20)+"</br>")
			document.writeln("my age = "+(age<=20)+"</br>")
		</script>
		<!-- java是不是出现类的是 用 import-->
		<script>
			var date = new Date();
			document.writeln(date)
			var d = new Object();
			alert(d);
			
		</script>
	</head>
	<body>
	</body>
</html>
